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Lack of cockpit coordination leads to altimeter missetting and altitude deviation for air carrier medium large transport flight crew.
| Attributes | |
| ACN | 170580 |
| Time | |
| Date | 199102 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hlg |
| State Reference | WV |
| Altitude | msl bound lower : 16300 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : zob |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 14000 flight time type : 150 |
| ASRS Report | 170589 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were cleared to descend to 17000'. As we passed 18000', captain called out '44.' I set 30.44 and it was actually 29.44. We had reviewed ATIS, however for some reason I set altimeter 1' lower than actual barometric setting. We then descended to 16300' (17300' on my altimeter) before noticing error. We immediately climbed back to 17000' on captain's altimeter and I reset my altimeter to 29.44. I think if the captain had called all 4 digits; i.e., '2-9-4-4,' I would have been less inclined to set 30.44, as I was somewhat distracted by flying the aircraft and thinking through the descent profile at the time he called the transition.
Original NASA ASRS Text
Title: LACK OF COCKPIT COORD LEADS TO ALTIMETER MISSETTING AND ALT DEVIATION FOR ACR MLG FLT CREW.
Narrative: WE WERE CLRED TO DSND TO 17000'. AS WE PASSED 18000', CAPT CALLED OUT '44.' I SET 30.44 AND IT WAS ACTUALLY 29.44. WE HAD REVIEWED ATIS, HOWEVER FOR SOME REASON I SET ALTIMETER 1' LOWER THAN ACTUAL BAROMETRIC SETTING. WE THEN DSNDED TO 16300' (17300' ON MY ALTIMETER) BEFORE NOTICING ERROR. WE IMMEDIATELY CLBED BACK TO 17000' ON CAPT'S ALTIMETER AND I RESET MY ALTIMETER TO 29.44. I THINK IF THE CAPT HAD CALLED ALL 4 DIGITS; I.E., '2-9-4-4,' I WOULD HAVE BEEN LESS INCLINED TO SET 30.44, AS I WAS SOMEWHAT DISTRACTED BY FLYING THE ACFT AND THINKING THROUGH THE DSNT PROFILE AT THE TIME HE CALLED THE TRANSITION.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.